Fixed wrong test of database name (affected optimization of ORDER BY)


VC++Files/client/mysqlclient.dsp:
  Add my_file.c
VC++Files/mysys/mysys.dsp:
  Add my_file.c
mysql-test/r/negation_elimination.result:
  Fix wrong test
sql-common/client.c:
  After merge fix
sql/sql_base.cc:
  Fixed testing of database name